Microsilica

Microsilica powder is light gray in color and contains about 94%-90% silicon dioxide. It is added to concrete under construction to strengthen, increase mechanical strength, compaction, increase durability against freeze-thaw cycles, and reduce permeability

Properties and effects of microsilica

Properties and effects of microsilica: Adding microsilica to the concrete mixture causes its active silicon oxide to combine with the free calcium hydroxide solution present in the capillary pores of the concrete, producing insoluble calcium silicate crystals, and ultimately causing the cement paste structure to compact and increase the strength of the concrete. 1. Increase the erosion resistance of the concrete. 2. Prevent the alkalization of the concrete Replacing microsilica instead of cement increases the rate of hydration, and due to the high viscosity of this material, the mixture becomes sticky and requires more water for proper flow. Due to the adverse effect of increasing the water-cement ratio on the durability of concrete, it is usually necessary to increase the fluidity of such mixtures by using a lubricant or superplasticizer.